The 4.10s shouldn't hurt your top end,it should actually get you higher up in the rpms in 5th gear(where the power is in the mod motors).I used Ford motorsport gears in mine,but I have used Richmond gears also and had no problems with either.I also thought that the dealership would be a fortune, but they have put a couple sets in for me and both times it has been $200.Just make sure that they put in the limited slip additive.
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